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X线管属贵重消耗品，延长其使用寿命关系到设备的使用效率及医疗卫生单位的社会效益和经济效益，因此倍受人们重视。我国目前对延长XG－500型X线机X线管的使用寿命方面做了一些工作，在一定程度上起到了积极作用，但均存在一定的不足。为此笔者对XG—500型X线机的灯丝加热电路
X-ray tube is a precious consumable product, and extending its service life relates to the use efficiency of equipment and the social and economic benefits of medical and health units. China has done some work to extend the service life of the XG-500 X-ray machine X-ray tube, which has played a positive role to a certain extent, but all have certain deficiencies. For this reason, the author of the XG-500 X-ray machine filament heating circuit